US 3325061 A
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Description (OCR text may contain errors)
June 13, 1967 o. T. ELLSWORTH 3,325,051
HYPODERMIC SYHINGE Filed Sept. 1, 1965 irrae/viKs United States Patent Calif.
Filed Sept. 1, 1965, Ser. No. 484,294 6 Claims. (Cl. 222386) My invention relates to medical appliances primarily for human use and is especially concerned with a hypodermic syringe that can be utilized either for the introduction or withdrawal of material to or from the human body.
While syringes of various sorts are utilized and have been proposed for introducing materials either subcutaneously or intravenously and also have been utilized for withdrawing various fluids from the body, this operation sometimes requires careful use of two hands, particularly for fluid withdrawal.
It is therefore an object of the invention to provide a syringe which can easily be used for introducing or withdrawing fluid material to or from the human body.
Another object of the invention is to provide a hypodermic syringe that can readily be operated by but one hand of the user..
Another object of the invention is to provide a hypodermic syringe which generally is of standard construction but which has in addition means for adapting it to one-hand use for either direction of operation.
Another object of the invention is to provide a hypodermic syringe the operation of which is visually indicated.
Another object of the invention is to provide a hypodermic syringe which generally is an improvement over hypodermic syringes presently available.
Other objects together with the foregoing are attained in the embodiment of the invention described in the accompanying description and illustrated in the accompanying drawings, in which:
FIGURE 1 is a view generally in side elevation showing the syringe of the invention as utilized with one particular hand grip;
FIGURE 2 is a plan, portions being broken away, showing the hypodermic syringe of the invention;
FIGURE 3 is a cross section, the plane of which is indicated by the line 3-3 of FIGURE 2;
FIGURE 4 is an end elevation, the view being indicated by the line 4-4 of FIGURE 2; and
FIGURE 5 is a cross section, the plane of which is indicated by the line 5-5 of FIGURE 2.
While the hypodermic syringe can be embodied in a number of different ways, it has successfully been incorporated and used as illustrated herein. In this embodiment, the syringe includes a generally circular cylindrical barrel 6 made of any suitable material. This customarily is a plastic material that can readily be sterilized or is sufficiently cheap to be disposed of after single use. The material of the barrel 16 is somtimes made completely transparent, but in accordance with the invention need not be so and can be of an opaque material.
One end of the barrel 6 is provided with a connector 7 to receive a standard hypodermic needle 8 in the usual way, while the other end of the barrel 6 is provided with an outstanding terminal flange 9 including tabs 11 and 12 arranged so that, if desired, they can act as stops for the adjacent fingers of a users hand. The barrel 6 is arranged to receive a plunger 13 which reciprocates therein along the axis of the barrel. The plunger is a composite structure and preferably includes a piston head 14 having a pair of sealing rims 16 and 17 thereon. The head 14 is joined to a piston rod 18 preferably comprised of radially arranged Patented June 13, 1967 plates acting in part as guides against the internal walls of the cylinder and terminating in a transverse disk-like head 19.
The arrangement as so far described can be utilized in the customary fashion of a hypodermic syringe in that the user by placing his fingers adjacent the tabs 11 and 12 and his thumb against the head 19 can readily depress the plunger or reciprocate it inwardly with respect to the barrel.
In accordance with the invention, there is provided means for assisting in withdrawing the plunger from the barrel. This means includes a slide 21 conveniently fabricated of plastic and arranged to overlie the barrel 6. The slide 21 is preferably arcuate in cross section concentric with the barrel and at one end is provided with notches 22 and 23 to interengage with a correspondingly notched portion of the head 19. The slide is also guided by sliding engagement with lugs 24 and 26 formed as part of the flange 9. In this way, the slide and the plunger are secured together for reciprocatory motion in unison and in both directions.
Preferably, the slide 21 has a roughened portion 27 for better frictional engagement with the thumb of a user operating the device. The slide 21 carries an indicating line or carries a terminal surface 28 which coincides substantially with the end of the plunger 13, so that an exterior observation of the end of the slide is an indication of the internal, end position of the plunger. To assist this visual indication, the barrel contains indicia 29 preferably in the form of the customary graduations indicating the content of the barrel in cubic centimeters.
In the use of this device for ordinary injection, the syringe can be used in the customary way by pressure against the head 19, or the syringe can be utilized by grasping the barrel 6 in the fingers with the users thumb on the roughened portion 27. By movement of the thumb, the plunger can then be moved inwardly or outwardly with equal facility, the amount of motion being observed by gauging the end of the slide against the indicia 29.
As an alternate manner of using the syringe, it can be grasped like a pencil with the barrel between the thumb and second finger of the user and the slide engaged by the index finger of the user. This grasping position also facilitates both inward and outward movement of the plunger. In the claims herein, reference is had to the thumb of the user engaging the slide, but it is to be understood that such operation is merely the usually preferred one and that some may prefer to utilize the so-called pencil grip with the index finger in contact with the roughened portion of the slide.
With this hypodermic syringe, it has been found that both injections and extractions can readily be accomplished with but one hand and in an accurate and controlled fashion. The mechanism is such that it can readily be disassembled if necessary by completely withdrawing the plunger and the slide from engagement with the barrel and the flange 9, and the parts can be sterilized if so desired.
What is claimed is:
1. A hypodermic syringe comprising a cylindrical barrel adapted to be grasped by the fingers of a users hand, a plunger reciprocable in said barrel, a slide connected to said plunger and overlying said barrel, and means on said slide adapted to be engaged by the thumb of said users hand for moving said slide axially in both directions to move said plunger in said barrel.
2. In a hypodermic syringe including a cylindrical barrel adapted to be grasped by the fingers of a users hand having a plunger reciprocable therein, a slide overlying said barrel and connected to said plunger, and means on said slide adapted to be engaged by the thumb of said users hand for moving said slide axially in both directions to move said plunger in said barrel.
3. A hypodermic syringe as in claim 2 in which said slide is attached to said plunger at one end of said slide and in which said thumb-engaging means is a rough portion of said slide at the other end thereof.
4. A hypodermic syringe as in claim 1 having means on said barrel for resisting rotation of said slide.
5. A hypodermic syringe as in claim 1 in which said slide is attached to said plunger at one end of said slide and in which said thumb-engaging means is a rough portion of said slide at the other end thereof.
4 6. A hypodermic syringe as in claim 2 having means on said barrel for resisting rotation of said slide.
References Cited UNITED STATES PATENTS 14,734 4/1856 Palmer 222-50 X 691,515 1/1902 Wieberg 222-386 X 2,198,666 4/1940 Gruskin 222-47 X 3,253,592 5/1966 Von Pechmann 222-386 X 10 ROBERT B. REEVES, Primary Examiner.
N. L. STACK, Assistant Examiner.